Lennox ML193UH030XE36B Installation Instructions Manual page 18

NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must
.
be same pipe size
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
1-1/2" Pipe
Number
Of 90° Model
Elbows
030/
070
Used
045
1 25 20
2 20 15
3 15 10
4 10
5
6
7
n/a
8
9
10
1-1/2" Pipe
Number
Of 90° Model
Elbows
030/
070
Usedl
045
1 20 15
2 15 10
3 10
4
5
6
n/a
n/a
7
8
9
10
Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
1-1/2" Pipe
Number
Model
Of 90°
Elbows
030/
070 090 110
Used
045
20 15
1
15 10
2
10
3
4
n/a
5
n/a
6
n/a
7
8
9
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 10,000
2" Pipe
Model
030/
090 110 070
045
81 66
76 61
71 56
66 51
61 46
n/a n/a
56 41
51 36
46 31
41 26
36 21
Concentric Termination Elevation 0 - 10,000
2" Pipe
Model
030/
090 110 070
045
73 58
68 53
63 48
58 43
53 38
n/a n/a
48 33
43 28
38 23
33 18
28 13
Space For Intake Air in Feet
Standard Termination at Elevation 0 - 10,000
2" Pipe
Model
030/
070
045
71 56
66 51
61 46
56 41
n/a
51 36
46 31
41 26
36 21
31 16
TABLE 5
2-1/2" Pipe
030/
090 110 070
045
44 24 115 100
39 19 110 95
34 14 105 90
29 100 85
24 95 80
19 90 75
14 n/a 85 70
80 65
n/a 75 60
70 55
2-1/2" Pipe
030/
090 110 070
045
42 22 105 90
37 17 100 85
32 12 95 80
27 90 75
22 85 70
17 80 65
n/a
12 75 60
70 55
n/a 65 50
60 45
TABLE 6
2-1/2" Pipe
Model
030/
090 110 070
045
34 14 100 95
29 9 95 80
24 4 90 75
19 85 70
14 80 65
9 75 60
4 70 55
65 60
60 45
Page 18
Model
030/
090 110
045
68 43 137
63 38 132
58 33 127
53 28 122
48 23 117
43 18 112
38 13 107
33 102
28 n/a 97
23 92
Model
030/
090 110
045
64 39 121
59 34 116
54 29 111
49 24 106
44 19 101
39 14 96
34 91
29 86
n/a
24 81
19 76
030/
090 110
045
53 28 117
48 23 112
43 18 107
38 13 102
33 8 97
28 3 92
23 87
18 82
13 77
3" Pipe
Model
070 090 110
137 118 118
132 113 113
127 108 108
122 103 103
117 98 98
112 93 93
107 88 88
102 83 83
97 78 78
92 73 73
3" Pipe
Model
070 090 110
121 114 114
116 109 109
111 104 104
106 99 99
101 94 94
96 89 89
91 84 84
86 79 79
81 74 74
76 69 69
3" Pipe
Model
070 090 110
117 98 98
112 93 93
107 88 88
102 83 83
97 78 78
92 73 73
87 68 68
82 63 63
77 58 58